Have an 85 Custom Deluxe 10 Chev P/U with 305 that was rebuilt to 350 at 72K. Now has 105K
Mileage sucks, getting 10 or 11 mpg.
Would it help to replace the 4 barrel Edelbrock with a 2 barrel? Or should I rebuild the 4 barrel?
Also, get a pinging noise when going up slight inclines on freeway until I give more throttle. EGR Valve?
Rear end gearing is for towing trailer so I know that's part of problem, but when I first had the truck got better mileage than now.